From: Mannix
Portrayed by: Mike Connors
Appears in: The Case of the Malevolent Mugging (FF, extended cameo)
Mentioned in The Case of the Nefarious Necklace
Reason for appearance: Sergeant Brice and Edith Fallon were in trouble in the Valley and Joe's office is there. It all fell into place kind of perfectly.
Eventually I plan to write a story where Della and Peggy meet and become friendly, as well as a full-fledged crossover mystery between the two series.